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3.1 detailed explanation of rtthread serial port device (V1)
2022-07-06 03:25:00 【rou252051452】
1、 A serial port (UART) Equipment description
rtthread adopt serial.c and serial.h Two files are used to manage serial port devices . adopt serial.h Structural body in rt_serial_device Define serial port equipment , The serial port device inherits from the device base class rt_device,rt_device Inherited from rt_object Base class , The inheritance relationship is as follows
The serial port device realizes the function of rt_device Inheritance of device base class , The private member of the structure determines the relevant operations of the serial port device .
struct rt_serial_device
{
struct rt_device parent;
const struct rt_uart_ops *ops;
struct serial_configure config;
void *serial_rx;
void *serial_tx;
};
typedef struct rt_serial_device rt_serial_t;
2、 Initialization and registration of serial port devices
Start-up phase rtthread It will be based on whether RT_USING_SERIAL Definition , stay hw_board_init Function to initialize the serial port device , stay rt_hw_usart_init In function DMA And serial port related configuration parameters , Finally call the function rt_hw_serial_register To achieve STM32 Serial port device association and device mounting .
int rt_hw_usart_init(void)
{
/*
Calculate the number of serial port devices
1、drv_uasrt.c The document went on struct stm32_uart Type array uart_obj The definition of ,
The number of arrays has macro definitions BSP_USING_UARTx It's the number of .
*/
rt_size_t obj_num = sizeof(uart_obj) / sizeof(struct stm32_uart);
/*
Assign the default value to the configuration information ,115200-8-n-1
*/
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
rt_err_t result = 0;
/*
According to macro definition DMA Initialization of relevant configuration information
*/
stm32_uart_get_dma_config();
/*
Mount the corresponding serial port peripherals according to the number of serial ports
*/
for (int i = 0; i < obj_num; i++)
{
uart_obj[i].config = &uart_config[i];
uart_obj[i].serial.ops = &stm32_uart_ops;
uart_obj[i].serial.config = config;
/* register UART device */
result = rt_hw_serial_register(&uart_obj[i].serial, uart_obj[i].config->name,
RT_DEVICE_FLAG_RDWR
| RT_DEVICE_FLAG_INT_RX
| RT_DEVICE_FLAG_INT_TX
| uart_obj[i].uart_dma_flag
, NULL);
RT_ASSERT(result == RT_EOK);
}
return result;
}
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